Improvement in slide-valves



AQs. NELSON.

Slide-Valves.

Patented Nov. 4,1873.

1 4 my I Z////////% w A w Z 00 2 4 M o N WHNEEEEE. 1/759 UNITED STATESPATENT OFFICE.

AROHIBAL S. NELSON, OF GONNEAUTVILLE, PENNSYLVANIA, ASSIGNOR OF ONE-HALFHIS RIGHT TO HIRAM F. HAMMON, OF SAME PLACE.

IMPROVEMENT IN SLIDE-VALVES.

Specification forming part of Letters Patent No. 144,282, dated November4, 1873; application filtd June 3, 1873.

To all whom it may concern:

Be it known that I, ARCHIBAL S. NnLsoN, of Gonneautville, county ofCrawford and State of Pennsylvania, have invented certain new and usefulImprovements in Slide-Valves, of which the following is a specification:

The nature of my invention relates to an improvement in slide-valves;and consists in making two extra openings in the valve-seat, and twoextra openings through the valve, by this device increasing the meansfor the quick introduction of steam, giving a full opening at one-eighthof the stroke; also, in avoiding friction and expense by the simplicityof construction and few parts of my device.

Figure 1 is a longitudinal section of my invention. Fig. 2 is a plan ofthe valve.

1 represents the valve-seat, having the usual receiving and exhaustports 2 and 3, and en haust-portei, and, in addition thereto, thereceiving-ports 5 5, opening into the ports 2 and 3. The valve 6 is anordinary slide-valve, having two extra openings or ports, 7 8,corresponding to and operating in conjunction with the two ports 2 Whenthe valve is open, as shown in Fig. 1, both the opening 8 and extra port5 admit steam, which is conveyed by port 3 to the cylinder. At the sametime the valve 6 closes the remaining extra port 5, and opens the port2, for the purpose of exhausting steam.

The advantage gained is the quick introduction of steam into thecylinder by the simultaneous opening of the two valve.

By my arrangement of ports in the valveseat and valve, a given amount ofspace is open in one-half of the time, and by the valve travelingone-half of the distance-that is to say, an opening of five-eighths (*2)of an inch is produced, by means of the two openings, by the movement ofthe valve five-sixteenths of an inch.

It will be observed that the port 2 or 3, as may be required, is amplefor the purpose of exhausting the steam. The extra port 5, therefore, isclosed.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is a a The valve-seat 1, having extrareceivingports 5 5, opening into ports 2 and 3, in combination with theslide-valve 6, having two openings, 7 and 8, so placed as to open theports 3 and 5, or the ports 2 and 5, when takports by a single ingsteam, and close the opposite port 5 when exhausting, as herein shownand described.

In testimony that I claim the foregoing as my invention, I hereuntoaffix my signature this 28th day of May, 1873.

ARGHIBAL S. NELSON. Witnesses:

A. S. POND, W. H. MONTAGUE.

